<script setup>
import { ref, onMounted } from 'vue'
import { getCategoryFilterAPI, getSubCategoryAPI } from '@/apis/category'
import GoodsItem from '@/views/Home/components/GoodsItem.vue'
import { useRoute } from 'vue-router'
const route = useRoute()

// 获取基础列表数据渲染
const goodList = ref([])

// 获取面包屑导航数据
const filterData = ref({})
const reqData = ref({
  categoryId: route.params.id,
  page: 1,
  pageSize: 20,
  // tab 切换排序字段
  sortField: 'publishTime'
})

const getFilterData = async () => {
  const res = await getCategoryFilterAPI(route.params.id)
  filterData.value = res.result
}

const getGoodList = async () => {
  const res = await getSubCategoryAPI(reqData.value)
  goodList.value = res.result.items
}
onMounted(() => getGoodList())
getFilterData()

// tab切换回调（tabChange是element内置的）
const disabled = ref(false) // 下拉列表数据加载结束，停止监听
const tabChange = () => {
  // console.log('tab切换了', reqData.value.sortField)
  disabled.value = false  
  reqData.value.page = 1
  getGoodList()
}


// 下拉列表处理（无限加载产品列表）
const load = async () => {
  // 获取下一页数据（页数加1）
  reqData.value.page++
  const res = await getSubCategoryAPI(reqData.value)
  // 新旧数据进行拼接，采用数组展开运算符拼接[...旧数据，...新数据] 展开成一个新数组
  goodList.value = [...goodList.value, ...res.result.items]
  // 加载完毕，停止监听。通过判断 items 长度，确定数据加载是否结束或者判断 items 是否为空
  if (res.result.items.length === 0) {
      disabled.value = true
  }
}
</script>

<template>
  <div class="container ">
    <!-- 面包屑 -->
    <div class="bread-container">
      <el-breadcrumb separator=">">
        <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item :to="{ path: `/category/${filterData.parentId}` }">{{ filterData.parentName }}
        </el-breadcrumb-item>
        <el-breadcrumb-item>{{ filterData.name }}</el-breadcrumb-item>
      </el-breadcrumb>
    </div>
    <div class="sub-container">
      <el-tabs v-model="reqData.sortField" @tab-change="tabChange">
        <el-tab-pane label="最新商品" name="publishTime"></el-tab-pane>
        <el-tab-pane label="最高人气" name="orderNum"></el-tab-pane>
        <el-tab-pane label="评论最多" name="evaluateNum"></el-tab-pane>
      </el-tabs>
      <!-- v-infinite-scroll是elementplus提供的指令监听是否满足触底条件，满足条件时让页数参数加一获取下一页数据，做新老数据拼接渲染。 -->
      <div class="body" v-infinite-scroll="load" style="overflow: auto" :infinite-scroll-disabled="disabled">
        <!-- 商品列表-->
        <GoodsItem v-for="goods in goodList" :goods="goods" :key="goods.id" />
      </div>
    </div>
  </div>
</template>

<style lang="scss" scoped>
.bread-container {
  padding: 25px 0;
  color: #666;
}

.sub-container {
  padding: 20px 10px;
  background-color: #fff;

  .body {
    display: flex;
    flex-wrap: wrap;
    padding: 0 10px;
    // height: 300px;
  }

  .goods-item {
    display: block;
    width: 220px;
    margin-right: 20px;
    padding: 20px 30px;
    text-align: center;

    img {
      width: 160px;
      height: 160px;
    }

    p {
      padding-top: 10px;
    }

    .name {
      font-size: 16px;
    }

    .desc {
      color: #999;
      height: 29px;
    }

    .price {
        color: $priceColor;
        font-size: 20px;
    }
  }

  .pagination-container {
    margin-top: 20px;
    display: flex;
    justify-content: center;
  }
}
</style>@/apis/category